Generalised additive model results for categorical variables (model for all patients) with OR of mortality when compared with reference group
| Variable | Category baseline | OR | 95% CI for OR | P value |
| PHCCT | No | Reference (ref.) group | ||
| Yes | 0.56 | (0.36 to 0.86) | 0.01 | |
| Gender | Female | Ref. group | ||
| Male | 0.93 | (0.75 to 1.15) | 0.50 | |
| Prehospital intubation | No | Ref. group | ||
| Yes | 2.29 | (1.47 to 3.59) | <0.01 | |
| GCS | 13–15 | Ref. group | ||
| 3 | 53.66 | (38.45 to 74.86) | <0.01 | |
| 4–5 | 17.86 | (11.40 to 27.98) | <0.01 | |
| 6–8 | 5.46 | (3.76 to 7.91) | <0.01 | |
| 9–12 | 3.53 | (2.59 to 4.83) | <0.01 | |
| Prospective Major Trauma Centre | No | Ref. group | ||
| Yes | 1.04 | (0.85 to 1.26) | 0.72 | |
| Mode of transport to hospital | Air ambulance | Ref. group | ||
| Land ambulance | 1.79 | (1.04 to 3.07) | 0.04 | |
| Severe head injuries | No | Ref. group | ||
| Yes | 1.04 | (0.84 to 1.29) | 0.71 | |
| SIMD quintile | Quintile 5 | Ref. group | ||
| Quintile 1 | 1.41 | (1.05 to 1.90) | 0.02 | |
| Quintile 2 | 1.20 | (0.89 to 1.63) | 0.24 | |
| Quintile 3 | 1.10 | (0.80 to 1.52) | 0.56 | |
| Quintile 4 | 1.11 | (0.80 to 1.54) | 0.53 | |
| Unknown | 1.05 | (0.73 to 1.51) | 0.81 |
PHCCT, prehospital critical care team; SIMD, Scottish Index of Multiple Deprivation.